You might as well compare with these Back Items so you can decide which Back Items you're gonna use for ninja Saga Pvp or in Hunting House for easier killing the boss or your opponent in ninja saga PvP
These Back Items might have better effect . Here we go :

• S3 Fossil of Magatama

  Increase purify chance by 6%. Has 10% chance to convert damage taken to HP positively.
• S8 Scroll of Golden Snake

  Increase all attack damage by 4%. Decrease damage taken by 4%.
• Scroll: Posion Attack
• Patriot Aegis

  A mythical shield that can block even the most vicious attacks. Increases max HP by 3%. Has a 60% chance to recover 5% of maximum HP and reduces damage taken by 75.
• S37 Ring of Chakra Flame

  Increase attack damage by 7%.
• Merlins Magical book

  Increases attack damage 5%
• Carp Flag
• S81 Wheel of Glory

  Reduce damage taken by 200. Increase Combustion chance by 15%. (Minimum requirement of 1 Attribute Point in Fire to activate combustion effect)
• Sakura Lantern

  Increase Combustion chance by 10%.(Minimum requirement of 1 Attribute Point in Fire to activate combustion effect). Has 10% chance to absorb 2% HP of enemy who attack you.
• Clouds And Mist Raijinco
• Call of the Angel

  Reduce damage taken by 100. Has 6% chance to convert damage taken to HP positively.
• Heian-kyo Shamisen
• Huginn & Muninn

  Reduce 4% damage taken. Has 10% chance to restrict enemy who attack user for 1 turn. Restriction target will not be able to use any skills.
• S17 Scorching Sun Scroll

  Has 30% chance to absorb 1% HP of enemy who attack you.
• Neptunes Healing

  Amazing power from Neptune. 3% chance to convert damage taken to HP positively and recover 3% HP at the start of every turn.
• Lucky Chess

  Has 5% chance to freeze enemy who attacks user (3 turn). Frozen target cannot move but damage taken is reduced by 80%. Each turn recover 100 HP and 100 CP.
• War Flag: Syoshin

  Increase mission XP reward by 100.
• Scroll: Fire and Earth
• Yatai Lantern
• Evil Claw Hammer

  Reduce 7 HP damage taken.
• Firefox Tail
• Soul of Egg Hunting Beast

  2012 Egg Hunting Event
• S31 Yabusa Dual Head Spear

  Increase 4% damage and 4% critical rate.
• Charming Aura (Pink)

  2012 Valentines day limited aura, reduce damage 2%.
• Christmas Bag

  Reduce damage taken by 10.
• Vertical Light

  Reduce 15 HP damage taken.
• S40 Gozen Breeze Back Item

  Recover 7% HP with every Charge.